Steam-engine governor



(No Model.) 2 Sheets-Sheet 1.

E. O. KNAPP.

STEAM ENGINE GOVERNOR.

' No. 584,370. Patented June 15,1897.

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WITNESSES.- INVENTOR, y 7 wwa 4 W (No Model.) 2 Sheets-Sheet 2.

E. C. KNAPP. STEAM ENGINE GOVERNOR.

o. 584,370. Patented June 15, 1897.

NiTn STATES EDlVIN C. KNAPP, OF SYRACUSE, NEW YORK.

STEAM-ENGINE GOVERNOR. V

SPECIFICATION forming part of Letters Patent No. 584,370, dated June 15, 1897. Application filed July 2, 1895. $erial No. 554,743. (No model.)

To all whom it may concern:

Be it known that I, EDWIN C KNAPP, a citizen of the United States, residing at Syracuse, Onondaga county, New York, have invented a new and useful Steam-Engine Governor, of which the following is a specification.

My invention relates to that type of governors which is secured to and rotates with the engine-shaft and is known as a shaftgovernor, or to the same type when used on an auxiliary shaft which gets its motion directly or indirectly from the engine-shaft. Its object is to maintain a constant leverage for the action of the forces transmitted from the governor weight or weights to that part which is rotated by the weights and is situated nearest the eccentric-rod (or concentric rod, as the case may be) in the chain of mechanism connecting that rod with the weights. I obtain this result by the mechanism illustrated in the accompanying drawings, in which- Figures 1 and 2 show the essential features of the mechanism, which consists of a pulleyrim 1 and metal bands or tapes attached thereto and wrapped around the circumference so as to rotate the pulley and the part to which it is attached in opposite directions as the excess of tension is thrown from one tape end to another by the governor weight or spring to which the tape ends are directly or indirectly attached. Figs. 3 and 4 show the same mechanism in a little different form having two tapes and four tape ends available for attachment to the governor weights or springs,as the case may be. Figs. 5 and 6 show still another arrangement having a single tape and two ends available for attachment to the weights or springs. Figs. 7 and 8 show the mechanism applied to a sleeve adapt-ed to rotate upon an eccentric or shaft. Fig. 9 shows it applied to a pin having a portion turned with its axis at an angle with the center line of rotation. Figs. 10 and 11 show it applied to a plain eccentric which rotates on the shaft. Fig. 12 shows it applied to a plain eccentric-pin. Fig. 13 shows it applied to a double-eccentric pin. Figs. 14 and 15 show it applied to an eccentric which swings across the shaft. Figs. 16 and 17 show successive governors constructed with the above-described feature, and Fig. 18 shows a plan for a double-weight balanced governor.

Similar figures represent similar parts throughout the several views.

In the drawings, 1 is a pulley-rim which may be a segment or a complete circumference. This pulley is rigidly attached to the first piece in the chain of mechanism between the eccentric-rod (or concentric rod) and the governor-weight which is rotated by the weight in making its adjustment for change of load. This rotating piece may be a sleeve, as shown in Figs. 7 and 8, which rotates about the cocentric and carries the eccentric-strap or its equivalent. It may be a pin having one part turned with its axis at an angle with the axis of rotation, as shown in Fig. 9. It may be a plain eccentric rotating about the shaft, as shown in Figs. 10 and 11. It may be a plain eccentric-pin, as shown in Fig. 12. It may be a double-eccentric pin, as shown in Fig. 13. It may be an eccentric-pin or an eccentric which swings across the shaft, as shown in Figs. 14: and 15.

In all the drawings, 2, 3, 4, and 5 are the ends of the metal bands or tapes attached to the pulley, as before described, these ends being available for attachment to lever-arms or circular segments which get their motion directly or indirectly from the governorweights or springs and rotate the pulley in opposite directions as the weight moves out or in', thus making the adjustment for change of load while maintaining the lever-arm of the forces acting upon the pulley practically constant throughout the entire range of the governor.

In Fig. 16 the pin shown in Fig. 9 is used and the pulley is rotated by the tapes, as shown, both tapes being attached directly to the weight-segment 6, thus rotating the pulley with a constant leverage and velocity ratio.

In Fig. 17 we have a governor in which the sleeve shown in Figs. 7 and Sis used and the ends of the tapes are held at the ends of the curved lever 7, which is swung about the pin 8 by the bell-crank 11, and the links 12 and 13 attached to the governor-weight arms. A spring 14 at the end of the arm 7 allows for inaccuracies in the motion of the tapes due to the difference between the length of the chord which the tape represents and the are around which itshould work for a constant velocity ratio. This feature may be introduced intoany of the arrangements either for this purpose alone or to take up any lost motion due to slackness of the tapes.

Fig. 18 shows another arrangement for a balanced double-weight governor. In this the arrangement of tapes is that shown in Figs. 3 and 4t, and each pair of ends is connected to the weight-arm segment, as shown in Fig. 16.

The governor-spring maybe used in any of the above arrangements to draw the pulley back to its original position as the weight dropsin, and a great number of arrangements of the same feature will readily suggest themselves to the designer.

With reference to'the pin shown in Fig. 9 it should be noted that the middle of the center line of the part that stands at an angle with the center line of the journals upon which it is rotated by the shifting of the governor is located upon the center line of said journals upon which it is rotated-that is, the center lines of the two parts intersect at the center of the part which stands at an angle and upon which the strap runs. The object of this arrangement is to maintain the throw of the pin constant regardless of its rotary or rolling motion with the shifting of the governor whether said throw be a positive quantity or'zero.

The action of the sleeve shown in Figs. 7'

and 8 is precisely the same as that of the above described pin. The shifting of the sleeve with the shifting of the governor causes only a rolling motion of the eccentric-rod if the throw be a positive quantity, or of the concentric rod if the throw be zero. This effect is due to the plane of the path of the strap standing at an angle with the perpendicular, as shown in Figs. 7 and 8, and said rolling motion of the sleeve does not in any way affect the throw.

By chain of mechanism is meant a kinematic chainthat is, a succession of machine parts or elements which transmit pressure or motion successively from one to another.

By rigidly attached is meant fastened in such a manner that the joined pieces shall act as a single solid piece. Vith such a fastening, then, any motion of one point of the composite piece relatively to another must be caused by springing.

By the term pulley I mean a member or body of circular or segmental or other suitable form by the movement of which the two oppositely-moving bands may be simultaneously taken up and let off, respectively.

What Iwish to claim as my invention and secure by Letters Patent is 1. In a shaft-governor, the combination of a pulley, drum, or cam, or segment thereof, having rigidly attached thereto a part having thereon a bearing adapted to carry an eccen trio-strap, with one or more metal bands or tapes, also rigidly attached to said pulley, drum, cam, or segment, and having'each pair of tape ends wrapped around the rim of said pulley, drum, cam, or segment in opposite directions and attached directly or indirectly to the weight or weights to give the pulley, drum, cam, or segment its rotary motion wit-h the shifting of the governor-weight, substantially as and for the purpose set forth.

2. In a shaft-governor, the combination of a pulley, drum, or cam, or segment thereof, having rigidly attached thereto a pin having a journal at its outer end turned at an angle with, and the middle of the center line of said journal situated on, the center line of its journals upon which it is adapted to be rotated by the shifting of the governor-weight, with one or more metal bands or tapes, also rigidly attached to said pulley, drum, cam, or segment, and having each pair of tape ends wrapped around the rim of said pulley, drum, cam, or segment in opposite directions and attached directly or indirectly to the weight or weights to give the pulley, drum, cam, or segment, its rotary motion with the shifting of the governor-weight, substantially as and for the purpose set forth.

3. In a shaft-governor, the combination of a pulley, drum, or cam, or segment thereof, having rigidly attached thereto a single or double eccentric pin, with one or more metal bands or tapes, also rigidly attached to said pulley, drum, cam, or segment, and having each pair of tape ends wrapped around the rim of said pulley, drum, cam or segment, in opposite directions and attached directly or indirectly to the weight or weights to give the pulley, drum, cam, or segment, its rotary motion with the shifting of the governor-weight, substantially as and for the purpose set forth.

4:. In a shaft-governor, the combination of a pulley, drum, or cam, or segment thereof, with one or more metal bands or tapes rigidly attached thereto and having each pair of tape ends wrapped around the rim of said pulley, drum, cam, or segment in opposite directions and attached directly or indirectly to the weight or weights to give the pulley, drum, cam, or segment, its rotary motion with the shifting of the governor-weight, substantially as and for the purpose set forth.

5. In a shaft-governor, the combination of a pulley, drum, or cam, or segment thereof having rigidly attached thereto a sleeve adapted to be rotated upon an eccentric or shaft, with one or more metal bands or tapes, also rigidly attached to said pulley, drum, cam, or segment, and having each pair of tape ends wrapped around the rim of said pulley, drum, cam, or segment, in opposite directions and attached directly or indirectly to the weight or weights to give the pulley, drum, cam, or segment, its rotary motion with the shifting of the governor-weight, substantially as and for the purpose set forth.

6. In a shaft-governor, the combination of a pulley, drum, or cam, or segment thereof,

having rigidly attached thereto an eccentric adapted to receive a rotary motion from the shifting of the governor-Weight, With one or more metal bands or tapes also rigidly attached to said pulley, drum, cam, or segment, and having each pair of tape ends wrapped around the rim of said pulley, drum, cam, or segment, in opposite directions and attached directly or indirectly to the Weight or weights to give the pulley, drum, cam, or segment, [0 its rotary motion with the shifting of the governor-Weight, substantially as and for the purpose set forth.

EDWIN O. KNAPR.

WVitnessesi BENJ. F. CoDN R, OHAs. A. PIERCE. 

